Call Microsoft, ask about a Site License.
Martin 71 said:
Hi, I was curious if anyone knew if it was possible to purchase 6 licenses for windows xp for a decent rate. I got hired to install windows on 6 computers and I don't want to pirate it and get in deep trouble. Does anyone know if there's an easy way to purchase cd keys that would allow me to install on these computers. And if there's a discount for purchasing 6 of them.